git.sesse.net Git - movit/blob - effect_chain.cpp

   1 #define GL_GLEXT_PROTOTYPES 1
   2
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <assert.h>
   6
   7 #include <GL/gl.h>
   8 #include <GL/glext.h>
   9
  10 #include "util.h"
  11 #include "effect_chain.h"
  12 #include "gamma_expansion_effect.h"
  13 #include "gamma_compression_effect.h"
  14 #include "lift_gamma_gain_effect.h"
  15 #include "colorspace_conversion_effect.h"
  16 #include "sandbox_effect.h"
  17 #include "saturation_effect.h"
  18 #include "mirror_effect.h"
  19 #include "vignette_effect.h"
  20 #include "blur_effect.h"
  21
  22 EffectChain::EffectChain(unsigned width, unsigned height)
  23         : width(width),
  24           height(height),
  25           last_added_effect(NULL),
  26           use_srgb_texture_format(false),
  27           finalized(false) {}
  28
  29 void EffectChain::add_input(const ImageFormat &format)
  30 {
  31         input_format = format;
  32         current_color_space = format.color_space;
  33         current_gamma_curve = format.gamma_curve;
  34 }
  35
  36 void EffectChain::add_output(const ImageFormat &format)
  37 {
  38         output_format = format;
  39 }
  40
  41 void EffectChain::add_effect_raw(Effect *effect, Effect *input)
  42 {
  43         effects.push_back(effect);
  44         outgoing_links.insert(std::make_pair(input, effect));
  45         incoming_links.insert(std::make_pair(effect, input));
  46         last_added_effect = effect;
  47 }
  48
  49 Effect *instantiate_effect(EffectId effect)
  50 {
  51         switch (effect) {
  52         case EFFECT_GAMMA_EXPANSION:
  53                 return new GammaExpansionEffect();
  54         case EFFECT_GAMMA_COMPRESSION:
  55                 return new GammaCompressionEffect();
  56         case EFFECT_COLOR_SPACE_CONVERSION:
  57                 return new ColorSpaceConversionEffect();
  58         case EFFECT_SANDBOX:
  59                 return new SandboxEffect();
  60         case EFFECT_LIFT_GAMMA_GAIN:
  61                 return new LiftGammaGainEffect();
  62         case EFFECT_SATURATION:
  63                 return new SaturationEffect();
  64         case EFFECT_MIRROR:
  65                 return new MirrorEffect();
  66         case EFFECT_VIGNETTE:
  67                 return new VignetteEffect();
  68         case EFFECT_BLUR:
  69                 return new BlurEffect();
  70         }
  71         assert(false);
  72 }
  73
  74 Effect *EffectChain::normalize_to_linear_gamma(Effect *input)
  75 {
  76         if (current_gamma_curve == GAMMA_sRGB) {
  77                 // TODO: check if the extension exists
  78                 use_srgb_texture_format = true;
  79                 current_gamma_curve = GAMMA_LINEAR;
  80                 return input;
  81         } else {
  82                 GammaExpansionEffect *gamma_conversion = new GammaExpansionEffect();
  83                 gamma_conversion->set_int("source_curve", current_gamma_curve);
  84                 gamma_conversion->add_self_to_effect_chain(this, input);
  85                 current_gamma_curve = GAMMA_LINEAR;
  86                 return gamma_conversion;
  87         }
  88 }
  89
  90 Effect *EffectChain::normalize_to_srgb(Effect *input)
  91 {
  92         assert(current_gamma_curve == GAMMA_LINEAR);
  93         ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
  94         colorspace_conversion->set_int("source_space", current_color_space);
  95         colorspace_conversion->set_int("destination_space", COLORSPACE_sRGB);
  96         colorspace_conversion->add_self_to_effect_chain(this, input);
  97         current_color_space = COLORSPACE_sRGB;
  98         return colorspace_conversion;
  99 }
 100
 101 Effect *EffectChain::add_effect(EffectId effect_id, Effect *input)
 102 {
 103         Effect *effect = instantiate_effect(effect_id);
 104
 105         if (effect->needs_linear_light() && current_gamma_curve != GAMMA_LINEAR) {
 106                 input = normalize_to_linear_gamma(input);
 107         }
 108
 109         if (effect->needs_srgb_primaries() && current_color_space != COLORSPACE_sRGB) {
 110                 input = normalize_to_srgb(input);
 111         }
 112
 113         effect->add_self_to_effect_chain(this, input);
 114         return effect;
 115 }
 116
 117 // GLSL pre-1.30 doesn't support token pasting. Replace PREFIX(x) with <effect_id>_x.
 118 std::string replace_prefix(const std::string &text, const std::string &prefix)
 119 {
 120         std::string output;
 121         size_t start = 0;
 122
 123         while (start < text.size()) {
 124                 size_t pos = text.find("PREFIX(", start);
 125                 if (pos == std::string::npos) {
 126                         output.append(text.substr(start, std::string::npos));
 127                         break;
 128                 }
 129
 130                 output.append(text.substr(start, pos - start));
 131                 output.append(prefix);
 132                 output.append("_");
 133
 134                 pos += strlen("PREFIX(");
 135
 136                 // Output stuff until we find the matching ), which we then eat.
 137                 int depth = 1;
 138                 size_t end_arg_pos = pos;
 139                 while (end_arg_pos < text.size()) {
 140                         if (text[end_arg_pos] == '(') {
 141                                 ++depth;
 142                         } else if (text[end_arg_pos] == ')') {
 143                                 --depth;
 144                                 if (depth == 0) {
 145                                         break;
 146                                 }
 147                         }
 148                         ++end_arg_pos;
 149                 }
 150                 output.append(text.substr(pos, end_arg_pos - pos));
 151                 ++end_arg_pos;
 152                 assert(depth == 0);
 153                 start = end_arg_pos;
 154         }
 155         return output;
 156 }
 157
 158 EffectChain::Phase EffectChain::compile_glsl_program(unsigned start_index, unsigned end_index)
 159 {
 160         bool input_needs_mipmaps = false;
 161         std::string frag_shader = read_file("header.frag");
 162         for (unsigned i = start_index; i < end_index; ++i) {
 163                 char effect_id[256];
 164                 sprintf(effect_id, "eff%d", i);
 165
 166                 frag_shader += "\n";
 167                 frag_shader += std::string("#define FUNCNAME ") + effect_id + "\n";
 168                 frag_shader += replace_prefix(effects[i]->output_convenience_uniforms(), effect_id);
 169                 frag_shader += replace_prefix(effects[i]->output_fragment_shader(), effect_id);
 170                 frag_shader += "#undef PREFIX\n";
 171                 frag_shader += "#undef FUNCNAME\n";
 172                 frag_shader += "#undef INPUT\n";
 173                 frag_shader += std::string("#define INPUT ") + effect_id + "\n";
 174                 frag_shader += "\n";
 175
 176                 input_needs_mipmaps |= effects[i]->needs_mipmaps();
 177         }
 178         frag_shader.append(read_file("footer.frag"));
 179         printf("%s\n", frag_shader.c_str());
 180
 181         GLuint glsl_program_num = glCreateProgram();
 182         GLuint vs_obj = compile_shader(read_file("vs.vert"), GL_VERTEX_SHADER);
 183         GLuint fs_obj = compile_shader(frag_shader, GL_FRAGMENT_SHADER);
 184         glAttachShader(glsl_program_num, vs_obj);
 185         check_error();
 186         glAttachShader(glsl_program_num, fs_obj);
 187         check_error();
 188         glLinkProgram(glsl_program_num);
 189         check_error();
 190
 191         Phase phase;
 192         phase.glsl_program_num = glsl_program_num;
 193         phase.input_needs_mipmaps = input_needs_mipmaps;
 194         phase.start = start_index;
 195         phase.end = end_index;
 196
 197         return phase;
 198 }
 199
 200 void EffectChain::finalize()
 201 {
 202         // Add normalizers to get the output format right.
 203         if (current_color_space != output_format.color_space) {
 204                 ColorSpaceConversionEffect *colorspace_conversion = new ColorSpaceConversionEffect();
 205                 colorspace_conversion->set_int("source_space", current_color_space);
 206                 colorspace_conversion->set_int("destination_space", output_format.color_space);
 207                 effects.push_back(colorspace_conversion);
 208                 current_color_space = output_format.color_space;
 209         }
 210         if (current_gamma_curve != output_format.gamma_curve) {
 211                 if (current_gamma_curve != GAMMA_LINEAR) {
 212                         normalize_to_linear_gamma(last_added_effect);  // FIXME
 213                 }
 214                 assert(current_gamma_curve == GAMMA_LINEAR);
 215                 GammaCompressionEffect *gamma_conversion = new GammaCompressionEffect();
 216                 gamma_conversion->set_int("destination_curve", output_format.gamma_curve);
 217                 effects.push_back(gamma_conversion);
 218                 current_gamma_curve = output_format.gamma_curve;
 219         }
 220
 221         // Construct the GLSL programs. We end a program every time we come
 222         // to an effect marked as "needs many samples" (ie. "please let me
 223         // sample directly from a texture, with no arithmetic in-between"),
 224         // and of course at the end.
 225         unsigned start = 0;
 226         for (unsigned i = 0; i < effects.size(); ++i) {
 227                 if (effects[i]->needs_texture_bounce() && i != start) {
 228                         phases.push_back(compile_glsl_program(start, i));
 229                         start = i;
 230                 }
 231         }
 232         phases.push_back(compile_glsl_program(start, effects.size()));
 233
 234         // If we have more than one phase, we need intermediate render-to-texture.
 235         // Construct an FBO, and then as many textures as we need.
 236         if (phases.size() > 1) {
 237                 glGenFramebuffers(1, &fbo);
 238
 239                 unsigned num_textures = std::max<int>(phases.size() - 1, 2);
 240                 glGenTextures(num_textures, temp_textures);
 241
 242                 for (unsigned i = 0; i < num_textures; ++i) {
 243                         glBindTexture(GL_TEXTURE_2D, temp_textures[i]);
 244                         check_error();
 245                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 246                         check_error();
 247                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 248                         check_error();
 249                         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 250                         check_error();
 251                 }
 252         }
 253
 254         // Translate the input format to OpenGL's enums.
 255         GLenum internal_format;
 256         if (use_srgb_texture_format) {
 257                 internal_format = GL_SRGB8;
 258         } else {
 259                 internal_format = GL_RGBA8;
 260         }
 261         if (input_format.pixel_format == FORMAT_RGB) {
 262                 format = GL_RGB;
 263                 bytes_per_pixel = 3;
 264         } else if (input_format.pixel_format == FORMAT_RGBA) {
 265                 format = GL_RGBA;
 266                 bytes_per_pixel = 4;
 267         } else if (input_format.pixel_format == FORMAT_BGR) {
 268                 format = GL_BGR;
 269                 bytes_per_pixel = 3;
 270         } else if (input_format.pixel_format == FORMAT_BGRA) {
 271                 format = GL_BGRA;
 272                 bytes_per_pixel = 4;
 273         } else {
 274                 assert(false);
 275         }
 276
 277         // Create PBO to hold the texture holding the input image, and then the texture itself.
 278         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 2);
 279         check_error();
 280         glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, width * height * bytes_per_pixel, NULL, GL_STREAM_DRAW);
 281         check_error();
 282         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 283         check_error();
 284
 285         glGenTextures(1, &source_image_num);
 286         check_error();
 287         glBindTexture(GL_TEXTURE_2D, source_image_num);
 288         check_error();
 289         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 290         check_error();
 291         // Intel/Mesa seems to have a broken glGenerateMipmap() for non-FBO textures, so do it here.
 292         glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, phases[0].input_needs_mipmaps ? GL_TRUE : GL_FALSE);
 293         check_error();
 294         glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, GL_UNSIGNED_BYTE, NULL);
 295         check_error();
 296
 297         finalized = true;
 298 }
 299
 300 void EffectChain::render_to_screen(unsigned char *src)
 301 {
 302         assert(finalized);
 303
 304         // Copy the pixel data into the PBO.
 305         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 2);
 306         check_error();
 307         void *mapped_pbo = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY);
 308         memcpy(mapped_pbo, src, width * height * bytes_per_pixel);
 309         glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB);
 310         check_error();
 311
 312         // Re-upload the texture from the PBO.
 313         glActiveTexture(GL_TEXTURE0);
 314         check_error();
 315         glBindTexture(GL_TEXTURE_2D, source_image_num);
 316         check_error();
 317         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, GL_UNSIGNED_BYTE, BUFFER_OFFSET(0));
 318         check_error();
 319         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 320         check_error();
 321         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 322         check_error();
 323         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 324         check_error();
 325
 326         // Basic state.
 327         glDisable(GL_BLEND);
 328         check_error();
 329         glDisable(GL_DEPTH_TEST);
 330         check_error();
 331         glDepthMask(GL_FALSE);
 332         check_error();
 333
 334         glMatrixMode(GL_PROJECTION);
 335         glLoadIdentity();
 336         glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0);
 337
 338         glMatrixMode(GL_MODELVIEW);
 339         glLoadIdentity();
 340
 341         if (phases.size() > 1) {
 342                 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 343                 check_error();
 344         }
 345
 346         for (unsigned phase = 0; phase < phases.size(); ++phase) {
 347                 // Set up inputs and outputs for this phase.
 348                 glActiveTexture(GL_TEXTURE0);
 349                 if (phase == 0) {
 350                         // First phase reads from the input texture (which is already bound).
 351                 } else {
 352                         glBindTexture(GL_TEXTURE_2D, temp_textures[(phase + 1) % 2]);
 353                         check_error();
 354                 }
 355                 if (phases[phase].input_needs_mipmaps) {
 356                         if (phase != 0) {
 357                                 // For phase 0, it's done further up.
 358                                 glGenerateMipmap(GL_TEXTURE_2D);
 359                                 check_error();
 360                         }
 361                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
 362                         check_error();
 363                 } else {
 364                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 365                         check_error();
 366                 }
 367
 368                 if (phase == phases.size() - 1) {
 369                         // Last phase goes directly to the screen.
 370                         glBindFramebuffer(GL_FRAMEBUFFER, 0);
 371                         check_error();
 372                 } else {
 373                         glFramebufferTexture2D(
 374                                 GL_FRAMEBUFFER,
 375                                 GL_COLOR_ATTACHMENT0,
 376                                 GL_TEXTURE_2D,
 377                                 temp_textures[phase % 2],
 378                                 0);
 379                         check_error();
 380                 }
 381
 382                 // We have baked an upside-down transform into the quad coordinates,
 383                 // since the typical graphics program will have the origin at the upper-left,
 384                 // while OpenGL uses lower-left. In the next ones, however, the origin
 385                 // is all right, and we need to reverse that.
 386                 if (phase == 1) {
 387                         glTranslatef(0.0f, 1.0f, 0.0f);
 388                         glScalef(1.0f, -1.0f, 1.0f);
 389                 }
 390
 391                 // Give the required parameters to all the effects.
 392                 glUseProgram(phases[phase].glsl_program_num);
 393                 check_error();
 394
 395                 glUniform1i(glGetUniformLocation(phases[phase].glsl_program_num, "input_tex"), 0);
 396                 check_error();
 397
 398                 unsigned sampler_num = 1;
 399                 for (unsigned i = phases[phase].start; i < phases[phase].end; ++i) {
 400                         char effect_id[256];
 401                         sprintf(effect_id, "eff%d", i);
 402                         effects[i]->set_uniforms(phases[phase].glsl_program_num, effect_id, &sampler_num);
 403                 }
 404
 405                 // Now draw!
 406                 glBegin(GL_QUADS);
 407
 408                 glTexCoord2f(0.0f, 1.0f);
 409                 glVertex2f(0.0f, 0.0f);
 410
 411                 glTexCoord2f(1.0f, 1.0f);
 412                 glVertex2f(1.0f, 0.0f);
 413
 414                 glTexCoord2f(1.0f, 0.0f);
 415                 glVertex2f(1.0f, 1.0f);
 416
 417                 glTexCoord2f(0.0f, 0.0f);
 418                 glVertex2f(0.0f, 1.0f);
 419
 420                 glEnd();
 421                 check_error();
 422
 423                 // HACK
 424                 glActiveTexture(GL_TEXTURE0);
 425                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
 426                 check_error();
 427                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1000);
 428                 check_error();
 429         }
 430 }